Well, like I said we romanticize Germany way too much perhaps
and it helps when the games are made widely accessible to anybody who has a TV set (because it has been carried by CCTV for as long as I remember).
Actually there had been quite a few Chinese players joining Bundesliga, as a matter of fact the first batch of Chinese players going abroad went to Germany. Yang Chen, who is from my hometown Beijing, was the first Chinese player ever to go overseas and he remains the most successful and prolific one to this day, scoring 21 goals in 94 appearances for Eintracht Frankfurt in 3 seasons between 1998 and 2001 and was selected by Kicker magazine three times as the best XI of Bundesliga back then. Another personal favorite of mine, Shao Jiayi, also from Beijing went to play for TSV 1860 Munich and then went on to play for Cottbus and Duisburg in early 2000's. So far there have been 5 Chinese players who played in Bundesliga vs. 5 played in the EPL vs. just 2 in La Liga (including the latest Wu Lei. the first one, Zhang Chengdong joined Rayo Vallecano in 2015 and only played as a sub in 4 games).
From my recollection not just Chinese players, more Japanese and South Korean players as well have played in the Bundesliga than any other leagues.